The Mahalaya Paksha rituals are held during the dark fortnight of Ashwayuja (September-October). This period is sacred for doing rituals and offering oblations to the souls of the departed ancestors. The last day of Mahalaya Paksha or Pitr Paksh is the most important day in a year to perform rites to departed souls. In 2007, Mahalaya Paksha is from September 27 to October 11. The Shradh Tarpan is on October 10 and Amawasya Shradh or the Mahalya is on October 11. In some calendars, especially Bengali, the Mahalaya is on October 10.